Variable throw vibratory head for screens, conveyers, and the like



July 13, 1948. H. H. HITTSON 2,445,175

VARIABLE THROW VIBRATORY HEAD I SCREENS, GONVEYERS, AND THE L 9Sheets-Sheet 1 Filed June 15, 1947 [/v vE v oa July 13, 1948. H. H.HITTSON 2,445,175 VARIABLE 'nmow vmnmony mam FOR SCREENS, couvmmns, m'1? Filed June 13, 1947 VEN TOE;

July 13, 19 8- H. H. HITTSON RI LE T CW VIBRATORY HEAD FOR RE 5, CVEYERS, AND THE LIKE Filed June 13. 1947 9 Sheets-Sheet 3 l/v VEN TOEJuly 13, 1948. H. H. HITTSON 2,445,175

VARIABLE THROW VIBRATORY HEAD FOR YERS, AND THE LIKE 9 Sheets-Sheet 4SCREENS, CONVE Filed June 13, 1947 [N VEN TOE ID 00 Ei .9 g |O+ I 82VARIABLE 'rrinov': VIBRATORY HEAD FOR scnmsus, CONVEYERS, AND THE LIKEFiled June 13, 1947 9 Sheets-Sheet 5 y 1948- H H HITTSON 2,445,175

l/v VEN TOE;

July 3, 1944;.v H H HITTSON 2,445,175

VARIABLE TE IROV I VIBRATORY HEAD FOR SCREENS, GONVEYERS, AND THE LIKE 9Sheets-Sheet 6 Filed June 1:5, 1947 N Ln O q l E 00 a '2 (a ok m P m h AL3/ 23 H. HITTSON VARIABLE THROW VIBRATORY HEAD FOR SCREENS, CONVEYERS,AND THE LIKE 9 Sheets-Sheet '7 July 13, 1948.

Filed June 13, 1947 v Fi .1.?

[/v VE/Y TOE VARIABLE THROW VIBRATORY HEAD FOR SCREENS CONVEYERS AND THELIKE 9 Sheets-Sheet 8 July 13, 1948. H. H. HITI'SON Filed June 13, 1947H. H. HITTSON VARIABLE THROW v July 13, 1948.

- nanmony HEAD FOR SCREENS, CONVEYERS, AND THE LIKE 9 Sheets-Sheet 9Filed June 13, 1947 a screen, conveyer, barrel Patented July 13, 1948SCREENS, CONVEYERS,

Barker H. Hittson, signor to The AND THE LIKE er Arlington, Ohio, as-Jeil'rey Manufacturing Company, a corporation 'of Ohio Application June13, 1947, Serial No. 754,582

27 Claims.

This invention relates to the like, and an, object oithe invention is toprovide improved mechanism of this type in which the forces developed orthe amplitude of vibration imparted to the attached mechanism may beadjusted while the device is running.

A further object of the invention is to provide an improved screen,feeder, or other vibratable deck with adjustable throw or force thrustinmechanism which will cause it to vibrate at variabie amplitude or withvariable force, which adjustment can be carried out while the machine isin operation.

A further object or the vide improved mechanism for driving a pair ofshafts, preferably concentric, in synchronism and for adjusting theirphase relation while in operation, with provision for adjusting therelative positions of the drive mechanism and the drive shafts.

A further object of the invention is to provide an improved conveyer, orthe like, with a differential vibratory head .in which the amplitude ofvibration or the conveying action may be ad- Justed while the machine isin operation.

Other objects of the invention will appear hereinaiter, the novelfeatures and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. 1 is a side elevational view of apparatus incorporating myinvention;

Fig. 2 is a side elevational view of a modified form of apparatusincorporating my invention;

Fig. 3 is a diagrammatic view on the line 3-3 of Fig. 1, showing thedrive between the motor and the head;

Fig. 4 is a diagrammatic view on the'line 4-4 of Fig. 2, showing thedrive between the motor and the head;

Fig. 5 is an end view of the vibratory head shown in Fig. 2 of thedrawings;

Fig. 6 is a sectional view on the line 6-4 of Fi 5;

Fig. '7 is a sectional view on the line 'l--1 of Fig. 6;

Fig. 8 is an elevational view of the drive mechanism and the phaseadjusting mechanism of the drive illustrated in Figs. 2 and 4 of thedrawings;

Fig. 9 is an end view of the apparatus of Fig. 8;

Fig. 10 is a sectional view on the line ill-40 of Fig. 9, with thedriving motor shown in elevation invention is to pro- Fig. 11 is an endview' of the driving head of a vibratory head for packer, shakeout, or nI 2 Fig. 12 is a sectional view for a portion of the driving head ofFig. 11; Fig. 13 is a side elevational view of a conveyer representinganother embodiment of my invention which is provided with a variablethrow or variable force vibratory head;

Fig. 14 is adiagrammatic view on the line H of Fig. 13, showing thedrive between the motor and the head;

Fig. 15 is an end view of the driving head of Fig. 13;

Fig. 16 is a sectional view on the line li -i6 of Fig. 15; I

Fig. 1'1 is a sectional view on the line il-l'l of Fig. 16;

Fig. 18 is a Fig. 16;

Fig. 19 is a sectional view on the line 19-49 of Fig. 15, showing onlythe end;

Fig. 20 is an elevational view, with parts in section, of the motordriven pulleys of the drive of Figs. 13 and 14 and associated apparatus;

Fig. 21 is a front elevational view of the drive apparatus of Fig. 20;

Fig. 22 shows a modified form of drive mechanism which may besubstituted for the drive of Figs. 8 and 9; and

Fig. 23 is a sectional and elevational view on the line 23-43 of Fig.22.

In Fig. 1 of the drawings there sectional view on the line 18-18 of isillustrated a combinationconveyer and screen including a deck 30 whichis provided with a transverse screen 3! adapted to deliver oversizematerial to a chute, the undersize material passing through the screen3! and being conveyed over the bottom of the deck 30 to a separatechute. Material may be fed to the deck 30 by a feed chute 32. The deck30 is supported for vibratory movement by any desired means, such asspring hanger mechanisms 33, attached to a building frame,superstructure, or the like, 34. The deck 30 is merely illustrative ofany form of deck which is mounted for vibratory motion, upon whichmaterial is to be vibrated for the purpose of screening, conveying, orthe like.

It has long been desirableto supply some simple vibratory mechanism tosuch a deck, as deck 30, in which the amplitude of vibration of the deckor the forces of the vibratory motion may be adjusted between widelimits, for example, from zero amplitude to a maximum, while the unit isin operation. This is desirable whether rectilinear or non-rectilinearvibration is imparted to the deck.

I have provided an improved vibratory head and driving and adjustingmechanism for this purpose. the vibratory head being seen at 35 andbeing mounted upon supporting arms 35 which are rigidly attached to thedeck 38 and the axis of which is along the axis of vibration of thevibratory head 35 which in the preferred form of the invention is sodesigned as to develop rectilinear vibratory motion.

The details of the vibratory head 35 and its driving and adjustingmechanism will be described hereinafter. For the time being it issufficient to say that it is driven from an electric motor, or the like,31, which may be mounted on the superstructure 34, there being a pair ofdrive pulleys 38 on the shaft of motor 31 and a pair of driven pulleys38 and 48 on the head 35, which pulleys 39 and 48 are driven by separateV-belts 4| and 42, respectively.

In Fig. 2 of the drawings there is a conveyer deck 43 mounted forrectilinear vibratory movement from a base 44 by means of bracket andspring means 45. Material to be conveyed by the deck 43 will bedelivered by chute 46 and will flow from the deck 43 over a chute at theright-hand end, as viewed in Fig. 2 of the drawings.

Vibratory motion is imparted to the deck 43 by means of a head 41 whichis connected to arms 48 rigid with the deck 43, the axes of the arms 48being inclined about the axis of the deck 43 along a line which isparallel with a rectilinear axis of vibration of the head 41. In certaindetails the head 41 differs from the head 85, as shall hereinafter bepointed out in detail. In addition, the drive mechanism for the head 41differs from that for the head 35, as hereinafter described morecompletely.

For the moment it is adequate to note that the head 41 has two separatedriven pulleys 49 and 58 driven from individual spring-biased pulleysand 52, respectively, which are driving pulleys and are driven by amotor 53. Individual V-belts 54 and 55 interconnect pulleys 48 and 5|and 58 and 52, respectively. There is also phase shifting mechanism 56for the two pulleys 48 and 58, including a pair of adjustable idlerrollers 51. The detailed structure of each of the broadly describedelements is hereinafter described in detail.

Attention is now directed particularly to Figs. 5, 6 and 7 of thedrawings and to the structure of the vibratory head 41. Said head 41includes a generally oval casing 58. Extending transversely of thecasing 58 is a shaft 59 which at its center is provided with aneccentric or unbalanced weight 68. The left-hand end of shaft 58 carriesa gear 6|, the hub of which is keyed thereto and is mounted on ananti-friction bearing 62 carried in a receiving cup in a side wall ofthe casing 58. A shaft 63 concentric with the shaft 58 is journaledthereon and carries an eccentric or unbalanced weight 64 which is splitin its middle and preferably connected by connecting means 65 to providefor its attachment to shaft 58, it being journaled thereto at oppositeends of the eccentric weight 64, as clearly illustrated in Fig. 6 of thedrawings.

As best illustrated in Fig. 7 of the drawings, the eccentric weight 68is adapted to rotate about the axis of shaft 59 within the eccentricweight 64. The shaft 63 is mounted in an anti-friction roller bearing 66in one of the end plates of the housing 58, and this bearing, of course,acts to support the adjacent portion of shaft 58, since it is journaledwithin shaft 63. Shafts 58 and 63 project outwardly through the casingor housing 58, the former extending beyond the end of the latter andcarrying pulley 58 which is keyed and removably locked to the outer endof said shaft 58. 4The outer end of shaft 53 is keyed to pulley 8.

' Preferably, but not necessarily, there is brake mechanism which tendsto keep the two shafts 58 and 63 rotating in synchronism, which may beovercome to provide for their phase adjustment. One form of such brakemechanism is illustrated particularly in Figs. 5 and '6 of the drawingsand includes a brake drum 61 formed integral with pulley 58, and a brakeband 68 which is attached to pulley 48 by a pin 69, the braking actionof said band 68 being adjustable as by adjustable screw mechanism 10. Agear 1| is keyed to the left-hand end of shaft 63, as viewed in Fig. 6,oz, in other words, adjacent the eccentric weight The two eccentric orunbalanced weights 58 and 64 constitute what in effect is a singlecomposite weight or mass in which, during the operation of the head,said two weights 68 and 64 rotate in synchronism. As a consequence theeffective force or the effective amplitude of vibration developedthereby will be determined by their combined actions. Their weights andradii are so calculated that when their centers of ravity arediametrically opposite, as they are in the positions illustrated inFigs. 6 and 7 of the drawings, they substantially neutralize each otherso that during rotation they produce substantially zero vibratory force.This obviously is only one illustration of the minimum vibratory forcewhich may be effected, depending upon the design of these two eccentricor unbalanced weights.

If, however, the relative phase relation of the two eccentric weights 68and 64 is shifted 188 from that illustrated in Figs. 6 and 7, theirvibratory forces will be added and a maximum vibratory force will beproduced for rotation at any given speed. If the vibratory head 41included only the mechanism so far described, it would produce anon-rectilinear or generally circular vibratory motion when driven. Itis to be understood that within certain broad aspects of my inventionthis type of non-rectlinear vibratory head is embraced. In such astructure, of course, the gears 6| and 1| are not required and would beomitted.

However, in more specific aspects of the invention I prefer to provide ahead which will produce rectilinear vibratory motion, since this isparticularly desirable with conveyers and in some types of screens,barrel packers, shakeouts, and the like. To this end, within the casing58 there is a second vibratory assembly which is similar in manyrespects to that above described. It includes a shaft 12 provided withan eccentric or unbalanced weight 13 having a gear 14 keyed to theleft-hand end, the hub of which is mounted in an anti-friction rollerbearing 15 carried in a cup of the casing 58. Gear 14 meshes with and isdriven by gear 6| and they are preferably so intermeshed that thevibratory rectilinear force which they produce in combination is atright angles to a plane passing through the axes of shafts 59 and 12. Itis obvious that the gears 6| and 14 cause theseweights 68 and 13 torotate in opposite directions so that once said gears 6| and 14 areintermeshed the axis of the vibratory forces produced by them will befixed. This axis may be shifted by disengaging gears 6| and 14 andchanging their mesh.

Journaled on the shaft 12 is a split. eccentric or unbalanced weight 15which is similar to the unbalanced weight 54, it having a. shaft 11which is concentric with the shaft 12 and is journaled thereon and isreceived in an anti-friction roller bearing 18 in a cup in the casing55.

Shaft 11 carries a gear 19 which is keyed thereto and which meshes withthe gear 1 It may be mentioned that all of the gears 1|, 14 and 19 arethe same size. The intermeshing gears 1| and 19 provide for the drivingof the eccentric 15 from the driven shaft 53, and gears 1| and 19 are someshed that the axis of vibration of the rectilinear vibratory forceproduced by them is coincidental with that produced by the weights 55and 19.

It is obvious that since weights 55 and 13 are geared together and sinceweights 54 and 15 are geared together, adjustment of the phase relationbetween weights 55 and 64 will automatically similarly adjust the phaserelation between weights 19 and 15. As a consequence of this fact, byovercoming the frictional driving relation between the two shafts 59 and53 provided by the brake mechanism 55, it is possible to adjust thephase relation between weights 5|) and 13 on the one hand and weights 54and 16 on the other, to adjust the force produced by the head 41 whenthe unbalanced weight assemblies are rotating, this adjustment beingpossible between minimum and maximum values, the minimum valuepreferably being zero, in which the unbalanced forces produced by theweights 50 and 13 balance the forces produced by the weights 54 and 15.

Attention is now directed to Figs. 8, 9, and 10 of the drawings and tothe driving mechanism for the driven pulleys 49 and 50 and theirassociated shafts 53 and 59, respectively, which is designed so asnormally to drive the two pulleys 49 and 55 in synchronism, but whichmay be adjusted so as to change the phase relation between these shaftsand consequentlyadjust the phase relation between unbalanced weights 55and 13 and unbalanced weights 54 and 15.

The electric driving motor 53 is preferably mounted on a base 85 towhich a cylindrical front plate 8| is attached. Mounted for rotaryadjustment on the plate 8-| is a second plate 82 provided with aclamping ring 83 by which plate 82 may be attached to plate 8| in anyposition of adjustment, this adjustment being about the axis of therotor of motor 53. Plate 82 carries a plaform 84 carrying spacedanti-friction bearings 85 which support a pulley shaft 55 driven frommotor 53 through a flexible coupling 81. Mounted on the shaft 85 are thepreviously mentioned spring loaded pulleys 5| and 52, the effectivediameters of which may be adjusted by adjusting the tension of thecooperating V-belts 54 and 55.

The previously mentioned idler rollers 51 which roll on the belts 54 and55 are mounted on the previously mentioned phase. shifting mechanism 55which includes a parallel motion mechanism formed by spaced centrallypivoted arms 85 and 59, the outer ends of which are pivotally connectedto upstanding" arms 95 and'9|, the upper free ends of which'carry therollers 51, there being a roller 51 in aligmnent with each of thepulleys 5| andg52 and in contact with the associated belts-54 and 55.Centrally pivoted arm 59 has an integral downwardly extending handle 92which may be shifted laterally in reverse direction selectively to,spread one of the springpressed pulleys 5| or 52, thereby to modify itsnormal driving ratio to its driven pulley 4'9 or 55 to effect a phaseadjustment of the shafts 59. and 55 and control eccentric or unbalancedweights 55, 54, 15 and 15.

The idler rollers or pulleys 51 may or may not preload the belts 54 and55 and thus preload the adjustable pulleys 5| and 52, depending upondesired conditions. If preloading is desired, the phase shiftingmechanism 55, is so adjusted that these pulleys normally deflect theassociated belts 54 and 55. If no preloading is desired, they merelyroll idly thereon without any normal deflection. The action of the phaseshifting mechanism 55 is slightly different, depending upon whether itpreloads the belts 54 and 55 or does not preload the n If it preloadsthe belts, the operation of the handle 92 in either of its reversedirections will simultaneously increase the tension on one of the armsand decrease the tension on the other, which will simultaneouslyincrease the effective diameter of one ofthe pulleys 5| or 52 anddecrease the effective diameter of the other. On the other hand, if nopreloading of the belt is effected by phase shifting mechanism 55, whenhandle 92 is operated in one direction it will merely deflect one beltwithout affecting the other at all, and only one of the pulleys 5|, 52will have its effective diameter decreased.

Another. effect of the preloading is that the phase shifting mechanismacts as a compensator to compensate for any diflerences in the drivingratios of the shafts 59 and 59 which may be due to small differences inthe effective diameters of the pulleys 5|, 52 or of the pulleys 49, 59.Also the preloaded phase adjusting require less shifting of the handle92 to give the same phase shift between the shafts 59 and 53.

As illustrated in the drawings, both of the pulleys 5| and 52 are springloaded and this is desirable to the end that during operation of thevibratory mechanism it is possible to adjust the amplitude of vibrationor the developed force either to increase it or decrease it from anyposition intermediate its two extreme positions.

However, it is obvious that in certain broader aspects of the inventiononly one spring-loaded pulley and associated mechanism may be employed.In such an instance the phase relation of the two shafts 59 and 59 andtheir controlled unbalanced weights may be adjusted, but from any givenposition of adjustment they can only be adjusted in one direction andnot in reverse directions. For example, if the unit is operating at halfits maximum amplitude and the phase adjusting mechanism was such that itonly operated to increase the amplitude, it would be necessary for theoperator to adjust the throw to the maximum and then reduce it belowhalf its maximum in case he desired an ultimate amplitude which was lessthan that of the original setting. namely, half amplitude. It is also tobe noted that the spring-loaded pulleys are preferably the .drivingpulleys, though it is evident that the driven pulleys may be thespring-loaded ones, if desired.

As clearly illustrated in Figs. 8, 9 and 10 of the drawings, the phaseshifting mechanism 55 is all mounted on a bracket 93 which is carried onthe platform 54. The purpose of the adjustable mounting of the plate 52and platform 54 with respect to the base 95 and plate 8| is two-fold.First of all, it allows swinging of the platform 84 and phase adjustingmechanism 55 so that the pulleys 51 may' either preload the belts 54,55, as abovementioned, or may roll idly thereover without preloadingthem. In

brake associated with drum addition, this adjustment provides for thebelts II and 55 extending irorfi the pulleys I and 52 at differentangles to -t illustrations of two dln'erent angles which the belts maytake, it is to be noted that in Fig. 1 of the drawings the general planeof the belts is downwardly from the axis of the drive pulleys, while inthe installation of Fig. 2 the axis of the belts is inclined upwardlyrelative to the axis of the drive pulleys. These two would require quitedifferent settings of the phase adjusting mechanism 56 if it wereemployed to drive the heads. Obviously the head 41 and drive mechanismdisclosed in Fig. 2 may be positioned as illustrated in Fig. 1 as wellas a great variety of other positions.

In Figs. 11 and 12 of the drawings there is illustrated the head 35which is shown in Fig. 1 of the drawings, with the drive illustrated inFigs. 1 and 3. This head is the same in structure as the head 41 shownin detail in Fig. 6, except for such differences as shall now be pointedout. The shafts 59 and 63 are elongated somewhat to receive pulleys 39and "which replace pulleys l9 and 59, respectively. The pulleys 39 and49 have integral brake drums I5I and I52, respectively. There is anindividual hand operate'd brake mechanism associated with each of thedrums I5I and I52, the outer of these brakes being seen at 94 incooperation with the brake drum I52. Brake mechanism 94 includes achannel-like supporting bracket 95 which is attached to the casing 58.and is provided with an operating handle 96 which controls a threadedshaft 91 for adjusting the brake mechanism 94 toward and from the drumI52. Similarly individually operable brake mechanism is also preferablyprovided for the drum I5l, being mounted on the same bracket 95. Thisbrake mechanism is the phase shifting mechanism for this particulardrive and consequently the phase shifting mechanism 56 previouslydescribed is eliminated, the two pulleys 39 and 49 being directly drivenfrom the driving motor 31 by independent pulleys 38 and belts 4| and 42,as illustrated in Fig. 3 of the drawings.

To eifect adjustment of the phase relation of shafts 59 and 63 and theshafts 12 and 11 and their rigidly attached eccentric weights by thismechanism, one of the brakes 94 is applied until the brake 68 slips,thus producing a phase shift between the shafts 59 and 63. The twoindividual brake mechanisms for the separate drums I 5I and I52 arepreferably provided so that the amplitude of vibration or the force maybe adjusted selectively in either of opposite directions from anyposition between the maximum and minimum adjustments. That is, if thebrake associated with drum I52 is applied when the amplitude is half ofmaximum, an increase in amplitude may be effected. Conversely, if theISI is applied, a decrease in amplitude may be directly efiected.

Obviously within broader aspects of the invention only a single brakeneed be employed, for example, drum I5I alone need be provided withassociated brake mechanism. In this case the phase shifting may takeplace to change from any given amplitude to any other given amplitude,but it must be effected in only one direction of adjustment similar; tothat above described for the adjustment of head 41, where only onespring-pressed pulley is employed.

In Fig. 13 of the drawings there is illustrated a conveyer including adeck 98 mounted from a e vibratory head. As

Y ential mechanism I 9'3.

The head I9I includes a casing or housing I94 within which there is adouble differential rectilinear reciprocating or vibrating mechanismincluding four sets of unbalanced weights, two of which are of compositeconstruction and all of which are geared to rotate together, with a pairof the unbalanced weights which are not of composite construction beingso geared as to rotate at twice the speed of the composite weightassociated therewith to produce the differential motion. The twocomposite unbalanced weight assemblies may be identical with thecomposite unbalanced weight assemblies heretofore described, such asthose illustrated in Fig. 6 or in Fig. 12 of the drawings. The compositeunbalanced weight assemblies therefore need no special description andwill merely be generally designated by the reference characters I95,I96,

respectively.

In view of the similiarity of these parts in the head I9I, the samereference characters are used to designate the elements as those incon-.

nection with the previously described head. There is one differencewhich may optionally be employed or omitted, which is evident from acomparison of Figs. 6 and 19; that is, the shaft 11 may extend throughthe casing I94 and be provided with a drive pulley I91. If and when this'pulley I91 is employed, it will be evident that the shafts 63 and 11will be driven through two belts and pulleys, while the shafts 59 and 12are driven through a single belt and pulley.

The desirability of the two belts and pulleys for the shafts 63 and 11lies in the fact that in the head I9I there is a pair of additionalnoncomposite or single unbalanced weights which are driven directly bythese shafts through the gears H and 19. This is clearly illustrated byreference to Figs. 16 and 18 of the drawings. That is, gear 1I mesheswith and drives a gear I98 (see Fig. 16) which is keyed to and drives ashaft I99 having an integral eccentric or un balanced weight II 9for-med thereon, the shaft I99 being journaled at opposite ends inbearings II I and I I2 in the casing or housing I99.

The gear I98 is smaller than the gear H and preferably the pitchdiameter of gear I98 is half that of gear 1I. As a. consequence,eccentric or unbalanced weight I I 9 will make two revolutions for everyrevolution of the composite weight 69, 64 and this will produce adifferential motion of a well known type so as to effect a conveyingaction on the deck 98 even though it is mounted on substantially uprightcantilevers I99.

It is, of course, evident that thereshould be two sets of thesedifferential unbalanced weights,

otherwise the produced motion will not be rectilinearbut will besubstantially circular. However, it is within certain broad'a'spects ofmy invention to employ a head having only one composite, weight, such asweight 69, 64, and one single unbalanced weight, such as weight II9.

Associated with the composite unbalanced weight I I provide a secondsingle and unbal- 9 anced weight II! which is substantially identical instructure with the unbalanced weight mechanism I09-I I2, it having adriving gear I ll meshing with and driven by the gear 19, gear I I4preferably having halt the itch diameter of gear I9 for reasons obviousfrom the above description.

Viewing the structure of the head MI in a slightly different manner itis evident that the upper portion thereof, as viewed for example in Fig.17 of the drawings, may be considered as providing essentially thestructure of the head disclosed in detail in Fig. 6, including a pair ofcomposite unbalanced weights which normally rotate in synchronism. whosephase relation may be adjusted to adjust the amplitude of vibrationproduced from a maximum to a minimum, the minimum preferably being zero.

Also within the head there is a second pair of unbalanced weights, eachdriven by one of the first pair of composite unbalanced wei hts I05,I05, the second pair of unbalanced weights being simple or non-compositein structure. Each pair of unbalanced weights as thus considered, thatis, considering the composite unbalanced weights I05. I05 as one pairand the non-composite unbalanced weights I09-I I and H9 as the secondpair, tends tion along the same axis which is along an axis at rightangles to a plane passing through the axes of the composite unbalancedweights I and I00 and also at right angles to a plane passing throughthe axes of the weights I09, III] and H3.

Adjustment of the effective weight of each of the composite weights I05,I05 is made substantially as above described in connection with the head41. Of course, there is no adjustment of the effective weights of thehigh speed weights I09, H0 and H9.

It is not possible with the head IM to adjust the phase relation ofshafts 59 and 53 and shafts 12 and 11 so as to reduce the amplitude ofvibration to zero, because even though the vibratory energy of thecomposite weights I05 and I05 may be reduced to zero, the vibratoryenergy of the weights I0 9, H0 and H3 still persists. However, theconveying action of the conveyer deck 98 may be reduced to zero becauseupon reducing the vibratory energy of composite weights I05 and I08 tozero, there will be substantially no differential motion imparted to theconveyer deck 98, as a consequence of which there will be no actualconveying because it is dependent upon the presence of this differentialmotion.

The phase shifting mechanism employed with the head I01, when theadditional pulley I01 is employed, differs only slightly from the phaseshifting mechanism illustrated in Figs. 8, 9 and 10 above described.However, it is illustrated in detail in Figs. and 21 of the drawings andincludes a double spring loaded pulley I which replaces the previoussingle pulley 5I. parts of the drive and phase shifting mechanism arethe same as those above described except that the phase shiftingmechanism now includes a double idler pulley I51 which cooperates withthe two V-belts 54 and H5 (see Fig. 14) which drive the pulleys 49 andI01, respectively.

In Figs. 22'and 23 of the drawings I have shown a modified form of phaseshifting mechanism generally designated I56 which may be substituted forthe previously described phase shifting mechanism 55, all otherstructure of the motor and drive pulleys 5| and 52 being preserved.

Instead of the parallel motion mechanism of to produce rectilinearvibratory mo-.

The other the phase shifting apparatus 55 I employ .an individual cranklever H6 and Ill for each of two idler pulleys H8 and H9 associated withthe belts 55 and 54, respectively. The crank levers H5 and I I1 arepivotally mounted on brackets I20 and III carried on the base orplatform 84. It

' is obvious that either of the levers I I5 or I I1 may be swung aboutits pivot to adjust the tension of the associated belt or 50, therebyadjusting the effective diameter of the spring loaded drive pulley 5i or52 and overcoming the normal locking frictional connection between thedriven pulleys 49 and 50 provided by the brake 58. In some instances itmay be unnecessary to use brake mechanism 58 and merely rely upon thefriction between the shafts 59 and 53 to maintain them in their normalsynchronous relation.

c From the above description of the various features of my invention itis obvious that one outstanding feature is the fact that the vibratoryhead, whether it is of double construction so as to produce rectilinearmotion, or of single construction so as to produce non-rectilinear orsubstantially rotary motion, includes two relatively adjustable rotatingunbalanced weights which are driven by separate drive shafts.Furthermore, these drive shafts are so interconnected that they normallytravel together or in synchronism so that the two relatively adjustableweights in effect act as a single unbalanced weight which produce avibratory motion or force determined by the vector sum of the twoindividual vibratory forces.

Furthermore, by adjusting the phase relation between these two rotatingunbalanced weights, such as by causing one to travel at a differentspeed temporarily than the other, by the simple expedient of driving oneof the concentric shafts at a different speed than the other, it ispossible to adjust the vibratory force produced while the machine is inoperation. I have disclosed various specific mechanisms for effectingthis normal synchronous rotation of these unbalanced or eccentricweights which is capable of adjusting their phase relation.

It is eymem that other specific means may likewise employed for thispurpose within the realm ofgmy invention in certain of its broadaspects. As one illustration of additional means, the patent to W. E.Ewart, No. 2,247,153, dated June 24, ',1941, shows a mechanism fordriving two shafts 20 and 39 at speeds which may be in synchronism orslightly different. Such a mechanism might be employed so as to drivethe shafts 59 and 03 within certain broad aspects of my invention,though in more specific aspects of the invention I prefer the apparatusdisclosed in this application.

Another illustration of a prior art device which might be employed todrive the shafts 59 and 83 normally in synchronism but selectivelyasynchronously is that portion of the patent to Heyer et al., No.2,164,818, dated July the shafts I3 and I9 may be so driven. In otherwords, it is the asynchronous driving of the two shafts 59 and 53 bysome mechanism which provides for adjustment of the amplitude ofvibration of the composite unbalanced weights or the forces producedthereby by simple drive mechanism preferably including non-positivedrives of the belt type, which particularly distinguish my invention inits broad aspects from prior known devices.

Obviously those .skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit and4, 1939, by which -restricted to the 11 scope of the invention asdefined by the claims hereto appended, and I therefore wish not to beprecise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what Idesire to secure by Letters Patent Of the United States is:

1. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached to said frame to impart vibratory motionthereto, said vibratory head including a head frame, a pair of similareccentric weights mounted for rotation on said head frame, gearinginterconnecting said pair of weights providing for their rotation insynchronized opposite directions to develop a resultant periodicsubstantially rectilinear vibratory force, means for driving said pairof weights, at second pair of similar eccentric weights mounted forrotation on said head frame, gearing interconnecting said second pair ofweights providing for their rotation in synchronized opposite directionsto develop a resultant periodic substantially rectilinear vibratoryforce, means for driving said second pair of weights at least in partseparate from the driving means for said first pair of weights, said twodriving means acting normally to drive the two pair of weights insynchronism, and control means operative to alter the action of said twodriving means whereby one pair of weights is driven at a different speedfrom the other pair thereby altering the phase relation of the resultingvibrating forces of the two pair of weights to adjust the resultingamplitude of vibration of said deck frame, each of said driving meansincluding a belt and a driving head pulley, said control means includingmechanism for driving one of said pulleys at a different speed than theother including a brake for retarding the rotation of one of saidpulleys and causing its driving belt to slip.

2. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached to said frame to impart vibratory motionthereto, said vibratory head including a head frame, a pair of similareccentric weights mounted for rotation on said head frame, gearinginterconnecting said pair of weights providing for their rotation insynchronized opposite directions to develop a resultant periodicsubstantially rectilinear vibratory force, means for driving said pairof weights, a second pair of similar eccentric weights mounted forrotation on said head frame, gearing interconnecting said second pair ofweights providing for their rotation in synchronized opposite directionsto develop a resultant periodic substantially rectilinear vibratoryforce, means for driving said second pair of weights at least in partseparate from the driving means for said first pair of weights, said twodriving means acting normally to drive the two pair of weights insynchronism, and control means operative to alter the action of said twodriving means whereby one pair of weights is driven at a different speedfrom the other pair thereby altering the phase relation of the resultingvibrating forces of the two pair of weights to adjust the resultingamplitude of vibration of said deck frame, each of said driving meansincluding a belt and a driving head pulley, said control means includingmechanism for driving one 01 said pulleys at adiiferent speed than theother including a variable diameter pulley and means for adjusting itsdiameter.

3. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached of said two driving 12 to said frame to impartvibratory motionthereto, said vibratory head including a head frame, a

pair of similar eccentric weights mounted for rotation on said headframe, gearing interconnecting said pair of weights providing for theirrotation in synchronized opposite directions to develop a resultantperiodic substantially rectilinear vibratory force, means for drivingsaid pair of weights, a second pair of similar eccentric weights mountedfor rotation on said head frame. gearing interconnecting said secondpair of weights providing for their rotation in synchronized oppositedirections to develop a resultaut periodic substantially rectilinearvibratory force, means for driving said second pair of weights at leastin part separate from the driving means for said first pair of weights,said two driving means acting normally to drive the two pair of weightsin synchronism, and control means operative to alter the action of saidtwo driving means whereby one pair of weights is driven at a differentspeed from the other pair thereby altering the phase relation of theresulting vibrating forces of the two pair of weights to adjust theresulting amplitude of vibration of said deck frame, each of saiddriving means including a belt and a driving head pulley, said controlmeans including mechanism for driving one of said pulleys at a diiferentspeed than the other including a spring loaded variable diameter pulleyand means for adjusting the tension on one of said belts to adjust thediameter of said spring loaded pulley.

4. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached to said frame to impart vibratory motionthereto, said vibratory head including a head frame, a pair of similareccentric weights mounted for rotation on"'said head frame, gearinginterconnecting-said pair of weights providing for their rotation insynchronized opposite directions to develop a resultant periodicsubstantially rectilinear vibratory force, means for driving said pairof weights, a second pair of similar eccentric weights mounted forrotation on said head frame, gearing interconnecting said second pair ofweights providing for their rotation in synchronized opposite directionsto develop a resultant periodic substantially rectilinear vibratoryforce, means for driving said second pair of weights at least in partseparate from the driving means for said first pair of weights, said twodriving means acting normally to drive the two pair of weights insynchronism, and control means operative to alter the action meanswhereby one pair of weights is driven at a different speed from theother pair thereby altering the phase relation of the resultingvibrating forces of the two pair of weights to adjust the resultingamplitude of vibration of said deck frame, each of said driving meansinclud ng a belt and a driving head pulley, said control means includingmechanism for driving one of said pulleys at a different speed than theother.

5. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached to said frame to impart vibratory motionthereto, said vibratory head including a head frame, a pair of similareccentric weights mounted for rotation on said head frame, gearinginterconnecting said pair of weights providing for their rotation insynchronized opposite directions to develop a resultant periodicsubstantially rectilinear vibratory force, means for driving said pairof weights, a second pair of similar eccentric weights mounted a 13 forrotation on said head frame, gearing interconnecting said second fortheir rotation in synchronized opposite directions to develop aresultant periodic substantially rectilinear vibratory force, means fordriving said second pair of weights at least in part separate from thedriving means for said first pair of weights, said two driving meansacting normally to drive the two pair of weights in synchronism,

the action of said .two weights is driven at other pair thereby alteringthe phase relation of the resulting vibrating forces of the two pair ofweights to' adjust the resulting amplitude of vibration of said deckframe, each of said driving means including a belt and a driving headpulley.

6. Vibratory mechanism including a deck frame to be vibrated, avibratory head attached to said frame to impart vibratory motionthereto, said vibratory head including a head frame, a pair of similareccentric weights mounted for rotation on said head frame, gearinginterconnecting said pair of weights providing for their rotation insynchronized opposite directions to develop a resultant periodicsubstantially rectilinear vibratory force, means for driving said pairof weights, a second pair of similar eccentric weights mounted forrotation on said head frame, gearing interconnecting said second pair Iproviding for their rotation in synchronized opposite directions todevelop a resultant periodic substantially rectilinear vibratory force,means for driving said second pair of weights at least in part separatefrom the driving means for said first pair of weights, said two drivingmeans acting normally to drive the two pair of weights in synchronism,and control means operative to alter the action of said two drivingmeans whereby one pair of weights is driven at a different speed fromthereby altering the phase relation of t pair of weights to adjust theresulting amplitude of vibration of said deck frame.

7. A vibrator including a head frame, a composite adjustable forceeccentric assembly mounted therein for rotation including a pair ofeccentrics mounted for rotation on a common axis, one of said eccentricsbeing angularly adjustable relative to the other to adjust the effectiveeccentric weight of the assembly, independent drive shafts for saideccentrics, and belt and pulley drive means for driving said shaftsselectively in synchronism and asynchronism.

8. A vibrator including a head frame, a composite adjustable forceeccentric assembly mounted therein for rotation including a pair ofeccentrics mounted for rotation on a common axis, one of said eccentricsbeing angularly adjustable relative to the other to adjust the effectiveeccentric weight of the assembly, independent drive shafts for saideccentrics, and belt and pulley drive means for driving said shaftsselectively in synchronism and asynchronism, said drive means includinga variable diameter pulley and means for adjusting its diameter.

9. A vibrator including a, head frame, a composite adjustable forceeccentric assembly mounted therein for rotation including a pair ofeccentrics mounted for rotation on a common axis, one of said eccentricsbeing angularly adjustable relative to the other to adjust the effectiveeccentric weight of the assembly, independent drive shafts for saideccentrics, and belt and pulley drive means for driving said shaftsseleca different speed from the of weights pair of weights providingbratory eilect of during operation 14 tively in synchronism andasynchronism, said drive mechanism including brake mechanism for atleast one of said drive shafts applicable to cause it to rotate at a,slower speed than the other.

10. Vibratory apparatus including a frame to be vibrated, mechanismconstructed and arranged to vibrate said frame at a variable amplitudewhich may be adjusted while in operation including a pair of eccentricsone mounted to rotate within the other, means mounting said eccentricsfor rotation on concentric axes, a motor, separate drives extending fromsaid motor to each of said eccentrics including belt and pulley means,said separate drives being so proportioned as normally to drive said twoeccentrics in synchronism, and means operable to cause one of saideccentrics to slip relative to the other during operation therebyadjusting the combined vibratory effect of said two eccentrics, saidlast named means including brake mechanism for at least one of saideccentrics.

11. Vibratory apparatus including a frame to be vibrated, mechanismconstructed and arranged to vibrate said frame at a variable amplitudewhich may be adjusted while in operation including a pair of eccentricsone mounted to rotate within the other, means mounting said eccentricsfor rotation on concentric axes, amotor, separate drives extending fromsaid motor to each of said eccentrics including belt and pulley means,said separate drives being so proportioned as normally to drive said twoeccentrics in synchronism, and means operable to cause one of saideccentrics to slip relative to the other thereby adjusting the combinedvibratory effect of said two eccentrics, said last named means includinga variable diameter pulley and means for adjusting its diameter while inoperation.

' 12. Vibratory apparatus including a frame to be vibrated, mechanismconstructed and arranged to vibrate said frame at a variable amplitudewhich may be adjusted while inoperation including a pair of eccentricsone mounted to rotate within the other. means mounting said eccentricsfor rotation on concentric axes, a motor, separate drives extending fromsaid motor to each of said eccentrics including belt and pulley means,said separate drives being so proportioned as normally to drive said twoeccentrics in synchronism, and means operable to cause one of saideccentrics to slip relative to the other during operation therebyadjusting the combined visaid two eccentrics, said last named meansincluding a spring loaded variable diameter pulley and means foradjusting the tension on one of said belts therebyto adjust the diameterof said pulley.

13. Vibratory apparatus including a frame to be vibrated, mechanismconstructed and arranged to vibrate said frame at a variable amplitudewhich may be adjusted while in operation including a pair of eccentricsone mounted to rotate within the other, means mounting said eccentricsfor rotation on concentric axes, a motor, separate drives extending fromsaid motor to each of said eccentrics including belt and pulley means,said separate drives being so proportioned as normally to drive said twoeccentrics in synchronism, and means operable to cause one of saideccentrics to slip relative to the other during operation therebyadjusting the combined vibratory effect of said two eccentrics.

i4. Vibratory apparatus including a frame to be vibrated, mechanismconstructed and arcombined vibratory efl'ect ranged to vibrate saidframe at a variable amplitude -which may be adjusted while in operationincluding a pair of eccentrics, means mounting saldr egcentrics forrotation on concentric axes, a motor, separate drives extending fromsaid motor to each of said eccentrics including belt and pulley means,said separate drives being so proportioned as normally to drive said twoeccentrics in synchronism, and means operable to cause one of saideccentrics to slip relative to the other during operation therebyadjusting the of said two eccentrics.

15. A vibrator head including a pair of eccentrics one within the other,means mounting said eccentrics for rotation on concentricaxes. separatedriving means for each of said eccentrics, and friction brake mechanismreleasably frictionally connecting ,said drive means together wherebysaid eccentrics normally rotate in synchronism.

16; A vibrator head including a pair of eccentrics one within the other,means mounting said eccentrics for rotation on concentric axes, separatedriving means for each of said eccentrics, and mechanism releasablyfrictionally connecting saiddrive means together whereby said eccentricsnormally rotate in synchronism.

17. A vibrator head including a pair of eccentrics, means mounting saideccentrics for rotation on concentric axes, separate driving means foreach of said eccentrics, and mechanism releasably frictionallyconnecting said drive means together whereby said eccentrics normallyrotate in synchronism.

l8. Vibrating mechanism including a motor, two pulleys driven by saidmotor, two unbalanced a common axis, a pulley individual to each weight,two drive belts, one connecting one of said motor driven pulleys with anunbalanced weight pulley, the other connecting the other motor drivenpulley with the other unbalanced weight pulley, the sizes of saidpulleys being such that normally said two unbalanced weights rotate insynchronism, and means including a friction retarding brake for one ofsaid unbalanced weights operable to adjust the phase relation of saidunbalanced weights while they rotate.

19. Vibrating mechanism including a motor,

two pulleys driven by said motor, two unbalanced weights, means mountingsaid unbalanced weights for rotation on a common axis, a pulleyindividual to each weight, two drive belts, one connecting one of saidmotor driven pulleys with an unbalanced weight pulley, the otherconnecting the other motor driven pulley with the other unbalancedweight pulley, the sizes of said pulleys being such that normally saidtwo unbalanced weights rotate in synchronism, and means operable toadjust the phase relation of said unbalanced weights while they rotate.

20. Vibrating mechanism including a motor, two pulleys driven by saidmotor, two unbalanced weights, means mounting said unbalanced weightsfor rotation on a common axis, a pulley individual to each weight. twodrive belts, one connecting one of said motor driven pulleys with anunbalanced weight pulley, the other connecting the other motor drivenpulley with the other unbalanced weight pulley, the sizes of saidpulleys being such that normally said two unbalanced weights rotate insynchronism, at least one of said pulleys being a spring loadedadjustable diameter pulley, and means for adjusting the l6 tension onone of said belts to adjust the diameter of said spring loaded pulleyduring rotation thereof to adjust the phase relation between saidunbalanced weights.

21. Vibrating mechanism including a motor, two pulleys driven by saidmotor, two unbalanced weights, means mounting said unbalanced weightsfor rotation on a common axis, a pulley individual to each weight, twodrive belts, one connecting one of said motor driven pulleys with anunbalanced weight pulley, the other connecting the other motor drivenpulley with the other unbalanced weight pulley, the sizes of saidpulleys being such that normally said two unbalanced weights rotate insynchronism, a drive pulley for each unbalanced weight being springloaded adjustable in diameter, means operable to adjust the diameters ofsaid spring loaded .pulleys simultaneously and reversely to adjust thephase relation between said unbalanced weights while rotating includingan idler roller normally deflecting each belt from its normal pathbetween pulleys, pivoted cross arm 'means interconnecting said rollers,and means for pivoting said cross arm means to increase the deflectionof one of said belts and decrease the deflection of the other.

22. Vibrating mechanism including a motor, two pulleys driven by saidmotor, two unbalanced weights, means mounting said unbalanced weightsfor rotation on a common axis, a pulley individual to each weight, twodrive belts, one connecting one of said motor driven pulleys with anunbalanced weight pulley, the other connecting the other motor drivenpulley with the other unbalanced weight pulley, the sizes of saidpulleys being such that normally said two unbalanced weights rotate insynchronism, at least one of said pulleys being a spring loadedadjustable diameter pulley, and means for adjusting the tension on oneof said belts to adjust the diameter of said spring loaded pulley duringrotation thereof to adjust the phase relation between said unbalancedweights, said last named means including idler pulley means operable todeflect one of said belts.

23. Conveying mechanism including a deck, vibrator mechanism attached tosaid deck operable to impart rectilinear differential vibratory motionthereto including a, frame, four intergeared unbalanced weightmechanisms mounted on said frame for rotary movement, gearing drivingtwo of said weight mechanisms reversely at the same speed and two otherweight mechanisms reversely at the same speed and at twice the speed ofsaid first two mechanisms, means for adjusting the effective weights oftwo of said mechanisms which rotate at the same speeds, each of said twomechanisms including two weights of adjustable eccentricity mounted onseparate shafts, control mechanism operable while said mechanisms arerotating to adjust the phase rela-- tion between said shafts, saidcontrol mechanism including a separate drive pulley for each shaft, andmeans for temporarily driving themat different speeds.

24. Conveying mechanism including a deck, vibrator mechanism able toimpart rectilinear motion thereto including a frame, four intergearedunbalanced weight mechanisms mounted on said frame for rotary movement,gearing driving two of said weight mechanisms reversely at the samespeed and two other weight mechanisms reversely at the same speed and attwice the speed of said first two mechanisms, and means foraddifferential vibratory attached to said deck oper- 17 iusting theeffective weights of two of said mechanisms which rotate at the samespeeds.

25. Conveying mechanism including a deck, vibrator mechanism attached tosaid deck operable to impart rectilinear diiferential vibratorymotion-thereto including a frame, four intergeared unbalanced weightmechanisms mounted on said frame for rotary movement, gearing drivingtwo of said weight mechanisms reversely at the same speed and two otherweight mechanisms reversely at the same speed and at a different speedthan said first two mechanisms, means for adjusting the effectiveweights of two of said mechanisms which rotate at the same speed, eachof said two mechanisms including two weights of adjustable eccentricitymounted on separate shafts, control mechanism operable while saidmechanisms are rotating to adjust the phase relation between saidshafts, said control mechanism including a separate drive pulley foreach shaft, and means for temporarily driving them at different speeds.

26. Conveying mechanism including a deck, vibrator mechanism attached tosaid deck operable to impart rectilinear differential vibratory motionthereto including a frame, four intergeared unbalanced weight mechanismsmounted on said frame for rotary movement, gearing driving two of saidweight mechanisms reversely at the same speed and two other weightmechanisms reversely at the same speed and at a different speed thansaid first two mechanisms, means for adjusting the effective weights oftwo of said 18 mechanisms which rotate at the same speeds, each of saidtwo mechanisms including two weights of adjustable eccentricity mountedon separate shafts, and control mechanism operable while said mechanismsare rotating to adjust the phase relation between said shafts.

2'7. Conveying mechanism including a deck, vibrator mechanism attachedto said deck operable to impart rectilinear differential vibratorymotion thereto including a frame, four intergeared unbalanced weightmechanisms mounted on said frame for rotary movement, gearing drivingtwo of said weight mechanisms reversely at the same speed and two otherweight mechanisms reversely at the same speed and at twice the speed ofsaid first two mechanisms, means for adjusting the effective weights oftwo of said mechanisms which rotate at the same speeds, each of said twomechanisms including two weights of adjustable eccentricity mounted onseparate shafts, and control mechanism operable while said mechanismsare rotating to adjust the phase relation between said shafts.

I I-L HI'I'ISON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,884,246 Rldderstrom Oct. 25,1932 2,325,248 Johnstone June 27. 1948

